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Clarify that PeriodicWave real[0] is ignored #2710

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padenot merged 2 commits into from
Nov 6, 2026
Merged

Clarify that PeriodicWave real[0] is ignored #2710

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90fe37a
Clarify that PeriodicWave real[0] is ignored
padenot Nov 5, 2026
d17ca65
Note that PeriodicWave imag[0] is also set to 0
padenot Nov 6, 2026
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9 changes: 6 additions & 3 deletions index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -9995,15 +9995,18 @@ Dictionary {{PeriodicWaveOptions}} Members</h5>
::
The {{PeriodicWaveOptions/imag}} parameter represents an array of
<code>sine</code> terms. The first element (index 0) does not
exist in the Fourier series. The second element
exist in the Fourier series: it is set to 0 when the {{PeriodicWave}}
is constructed. The second element
(index 1) represents the fundamental frequency. The
third represents the first overtone and so on.

: <dfn>real</dfn>
::
The {{PeriodicWaveOptions/real}} parameter represents an array of
<code>cosine</code> terms. The first element (index 0) is the
DC-offset of the periodic waveform. The second element
<code>cosine</code> terms. The first element (index 0) is
ignored: it is set to 0 when the {{PeriodicWave}} is constructed,
so a {{PeriodicWave}} cannot produce a DC-offset. A DC-offset can
be added by connecting a {{ConstantSourceNode}}. The second element
(index 1) represents the fundamental frequency. The
third represents the first overtone and so on.
</dl>
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